Attachment for sulfite digesters.



PATENTED AUG. 29, 1905.

W. H. MOINTYRB. ATTACHMENT FOR SULPITE DIGESTERS.

APPLICATION FILED AYE. 12. 1905.

witnesses 031M; 5. swwnl TINTTED STATES PATENT @EETQE.

ATTACHMENT FOR SULFITE DIGESTERS.

Specification of Letters Patent.

Patented Aug. 29, 1905.

Application filed April I2, 1905. Serial No. 255,216.

To all whom, it may concern:

Be it known that I, WILLIAM H. MCINTYRE, a citizen of the United States,residing at Newtonfalls, in the county of St. Lawrence and State of NewYork, have invented certain new and useful Improvements in Attachmentsfor Sulfite Digesters; and I do declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form a part of thisspecilication.

This invention relates to new and useful improvements in attachments forsulfite pulpdigesters; and the object of the invention is to produce asimple and efficient means whereby the screen at the upper exit end ofthe digester may be kept clear of bits of wood, lime, &c., the tendencybeing for this material to go to the top of the digester, where thescreen is located, and clog the apertures of the screen and cause astoppage in the circulation of the steam and acid gases in the digester,thereby rendering the pulp worthless for paper-making.

The invention consists, further, in various details of construction andin combinations and arrangements of parts, which will be hereinafterfully described and then specifically defined in the appended claims.

My invention is illustrated in the accompanying drawings, in whichFigure 1 is a sectional view through the upper end ofthe digester, andFig. 2 is an end view of the screen and wiping device therefor.

Reference now being had to the details of the drawings by letter, Arepresents a digester showing an end plate B securely held thereto andprovided with an exit passageway C, which is suitably packed over theaperture leading through the plate B.

D designates a screen which projects over the face of a metallic plateE, which is held by said top to the digester.

K designates a yoke having'oppositely-disposed curved arms which conformto the curvature of said screen, and N designates a rod which passesthrough the apex of said screen and also through the central portion ofsaid yoke, and a nutO is fitted upon one end of said rod and is adaptedto hold said yoke securely in place. The shank portion of said rod Npasses through a suitable gland Q, and a wrench or handle may be appliedto its .outer free end, whereby the rod and the yoke carried thereby maybe conveniently turned for the purpose of causing the arms of the yoketo wipe against the convexed surface of said screen to clear the same ofchips, particles of lime, or other foreign material which might comeinto contact with the screen and which would have a tendency to stop thecirculation of the steam and acid gases in the event of the foreignmatter clogging the apertures N in said screen. It will be observed thatthe walls of said apertures N taper outwardly toward the top of thedigester, thereby forming a means whereby anyforeign matter which maypass into the contracted ends of the apertures will readily pass throughwithout clogging up the apertures.

By the foregoing construction it will be observed that whenever it isdesired to wipe the surface of the screen it may be done by the mererotation of the shaft carrying said yoke, thus making itpossible to havea free flow of the gases from the digester.

While I have shown a particular form of apparatus illustrating myinvention, it will be understood that I may vary the details of thesame, if desired, without in any way departing from the spirit of theinvention.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. In combination with a digester, having an exit end at the topthereof, a convexed screen fitted to the top and projecting into theneck of the digester, said screen having perforations, the walls ofwhich are diverging upward, a stirrer having arms adapted to wipeagainst the convexed surface of said screen and to clear the taperingends of said perforations of any foreign matter that might lodgetherein, as set forth.

2. In combination with a digester, a top secured over the neck of thedigester, and provided with a central aperture, an exit-pipe leadingthrough said aperture, a convexed screen, having flanges fixed to saidtop and projecting into said neck, said screen having In testimonywhereof I hereunto aflix my perforatlons, the Walls of whlch chvergefrom slgnature 1n presence of two Witnesses.

the eonvexed surface thereof, a rod passing 7 ILLIAM. T through saldex1t-open1ng and through an H MOILTYRE- 5 aperture in said screen, and aWiper, havlng Wvltnessesz v eoneaved arms adapted to clear any foreignCLARENCE J. KEPLER,

matter from the apexes of said perforations. FLORA Gr. RATAN.

